Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Tremolite from
McMahon Quarry (Greenspring Quarry), Pikesville, Baltimore County, Maryland, USA


Locality type:Quarry
Classification
Species:Tremolite
Formula:◻Ca2Mg5(Si8O22)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tremolite data
Locality Data:Click here to view McMahon Quarry (Greenspring Quarry), Pikesville, Baltimore County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:97066
Long-form Identifier:1:3:97066:6
GUID (UUID V4):0
Nearest other occurrences of Tremolite
2.4km (1.5 miles) ⓘBare Hills Copper Mine (Smith Avenue Copper Mine), Bare Hills, Baltimore County, Maryland, USA
9.9km (6.2 miles) ⓘMartin Marietta Texas Quarry, Cockeysville, Baltimore County, Maryland, USA
10.8km (6.7 miles) ⓘPatapsco Glen Construction Site, Woodlawn, Baltimore County, Maryland, USA
11.0km (6.8 miles) ⓘBok Asbestos Mine, Hollofield, Baltimore County, Maryland, USA
11.0km (6.9 miles) ⓘBeaver Dam Quarry (Baker and Connelly Quarry), Cockeysville, Baltimore County, Maryland, USA
12.7km (7.9 miles) ⓘUnnamed Amphibole occurrence [1], Cromwell Valley County Park, Loch Raven, Carney, Baltimore County, Maryland, USA
13.0km (8.1 miles) ⓘMinebank Run, Loch Raven, Carney, Baltimore County, Maryland, USA
14.0km (8.7 miles) ⓘLoch Raven, Carney, Baltimore County, Maryland, USA
15.2km (9.4 miles) ⓘMarriottsville Quarry, Hernwood, Baltimore County, Maryland, USA
15.2km (9.4 miles) ⓘGilmor Quarry, Baltimore County, Maryland, USA
References
Rocks & Minerals 10, 110.
Bernstein, Lawrence R. (1976) Minerals of Washington, D.C. and vicinity. Open-File Report Vol. 76-849. US Geological Survey doi:10.3133/ofr76849
Bernstein, Lawrence R. (1980) Minerals of the Washington, D.C. Area - Issue 5 of Educational series, Maryland Geological Survey. Department of Natural Resources, Maryland Geological Survey. p.1-148.
 
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